Fleet and asset maintenance
What it decides: for each service of each asset, on what date and in which workshop, across the whole horizon.
How it is modelled
Section titled “How it is modelled”| Piece | In this case |
|---|---|
| Resources | Each asset in the fleet is a resource. Its properties include the service types it needs, with their minimum and maximum interval and their duration |
| Tasks | Each service is a task of a given type, on an asset. Services already scheduled are fixed tasks |
| Horizon | Months or a year, in days |
| Objectives | Levelled availability, optimal service point and stability |
| Constraints | Interval between services, assets down at the same time, capacity per workshop and fixed windows |
Usage hours and dates
Section titled “Usage hours and dates”Many intervals are expressed in usage hours (or cycles, or kilometres), not in days. With the planned usage rate of each asset, hours are converted into dates. If the rate changes, the dates are recalculated.
Remaining margin
Section titled “Remaining margin”The remaining margin of an asset is how much margin it has left until its next service: the hours it can fly, run or operate without needing it. It answers questions such as “which assets can take an X-hour operation on day D?”.
Viability
Section titled “Viability”If there is no way to meet all the rules (for example, too many services in the same weeks for the workshops’ capacity), the plan is marked as not viable and says by how much it overshoots.
Spares
Section titled “Spares”Forecasting gives the expected consumption of spares with P50, P80 and P90 scenarios.
Data to get started
Section titled “Data to get started”Asset inventory, maintenance programme (service types, intervals and durations), usage history and planned rate, workshops with their capacity and, for forecasting, historical consumption of spares.